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A comment on The Adult Brain Does Grow New Neurons After All, Study Says. Parent comment

Re:The Adult Brain Does Grow New Neurons After All, Study Says by chongli on Monday March 25, 2019 @07:05PM (#19487616)
The case in point is the sciatic nerve is massive, and prone to constant stresses and strains, yet supposedly never regenerates.

Sciatica doesn't generally show up until people are in their 40s-50s. This is long after childbearing years for most people. At that point your sciatic nerve has done its job and gotten you across the finish line. What happens next is less important.

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Re:The Adult Brain Does Grow New Neurons After All, Study Says by jimmaswell on Monday March 25, 2019 @11:27PM (#19489058)
Less important but your fitness is still relevant in terms of survival of the tribe, which is selected for since it affects the survival of any one individual.
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Re:The Adult Brain Does Grow New Neurons After All, Study Says by TomMarius on Tuesday March 26, 2019 @03:15AM (#19489815)
Were there tribe members that lived in their 50s? I thought it was common to die before 40s.
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Re:The Adult Brain Does Grow New Neurons After All, Study Says by saiya-jin on Tuesday March 26, 2019 @05:07AM (#19490212)
50s you can still be pretty strong and endurant, provided no accident/degenerative disease happened. I would expect tribe of anybody but mindless savages would often protect their older if only due to their experience in survival (but maybe we were pretty much mindless savages during most of our evolution). 60s is when any remaining strength takes nose dive
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Re:The Adult Brain Does Grow New Neurons After All, Study Says by TomMarius on Tuesday March 26, 2019 @08:43AM (#19491227)
> 60s is when any remaining strength takes nose dive

Isn't that given modern nutrition, hygiene, water access, tooth cleaning etc?

The other commenter said that people that survived childhood during these times usually were expected to live around 54 years.

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Re:The Adult Brain Does Grow New Neurons After All, Study Says by anoncake on Tuesday March 26, 2019 @03:45AM (#19489914)
Low life expectancies in the past were mostly due to high child mortality.
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Re:The Adult Brain Does Grow New Neurons After All, Study Says by TomMarius on Tuesday March 26, 2019 @04:00AM (#19489966)
I know that and have accounted for that. I'm talking about prehistoric times, when we were developing.
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Re:The Adult Brain Does Grow New Neurons After All, Study Says by pickpuck on Tuesday March 26, 2019 @05:04AM (#19490196)
Based on the data from modern hunter-gatherer populations, it is estimated that at 15, life expectancy was an additional 39 years (total 54), with a 0.60 probability of reaching 15.

https://en.m.wikipedia.org/wiki/Life_expectancy

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